Rotary core drill



,UE- 19, "1930. l.. s. coPELlN ROTARY coRE DRILL Filed. sept'. 4. 192e roe.

9v-Tonner Patented Aug. 19, 1930 PATENT oFlFlcE LEONARD s. coPELrN, or Los ANGELES,`-CALIFORNIA ROTARY CORE DRILL Application led September 4, 1928. SerialrNo. 303,757.V

My invention relates to the `art of/taking cores by what is commonly known as the rotary method of drilling. y

, yDiiificulty is at times experienced in obtaining cores truly typical of the formation in which operations are being carried on, such difficulty being in part due to the fact that yin penetratingA hard formations the core becomes highly heated and swells thereby adhering to the wallsr of the core receiving opening in the drill. When cores stick in the drill as above 4referred to, thecontinued rotation of the drill breaks the core and further recovery of core is stopped until the clogged condition ofthe core receiving opening has beenremedied, which in. many cases is not accomplished until the drill' has'been raised from the hole. Y Y

yIt is the principal object of my invention to produce a device of simple form and construction which is insertable in the core receiving opening of the drill close to the mouth of such opening which will relieve the bind ing action of the core insuch opening.

This device consists of a ring having laterally extending openings therethrough which ring is freely and rotatably mounted in the core receiving opening of the drill close to the mouth of such opening.

Other objects and advantages will appear hereinafter from the following description and drawings.

' Referring to the drawings which are for illustrative purposes only Fig. lis a side elevation partly in section showing a coredrill embodying ka form of my invention.

Fig. 2 is an enlarged vertical sectlonal view of the lower end of the ydrill shown in Fig. 1.

Fig. 3 is an enlarged sectional plan view on line 3-3 in Fig. 2.

Fig. 4 is an enlarged perspective view of the form of ring used in one embodiment of my invention.

Fig. 5 is a perspective view similar to Flg. 4 showing a modified form of rin and Fig. 6 is a vertical elevation o the lower end of the drill shown in Fig. 1.

More particularly describing my invention as shown. in the drawings, ll designates a.

the core barrel may be body member, 12 the outer-barrel and 13 the inner barrel, the-upper end oftheouter barrel being provided with a sub 14 forconnection with the ordinary drill pipe, not shown.

The upper end ofthe innerbarrel or core barrel 13 is provided with ay valve '1.6A by means of which circulating fluid entrapped in discharged from above the advancing core. l l .v Secured tothe lower end of the inner barrel as 'by welding indicated at 18, is a collar 19 interiorly threaded to receive the upper end of a sleeve the lower end of such collar being seated on a shoulder 21- formed in the, .body member 11. A I

The lowerl end of the body member 11 is provided with a transversely extending slot 22 which receives keys 23 formed on the upper end of a cutting head 24, such connection ofA the cutting head to the body member being fully shown and describedy in my former, Patent Number 1,599,810. The lower end ofthe sleeve 20 is seated on a shoulder 26 formed in the cutting head, the lower end of the sleeve being eXteriorly threaded to receive theinteriorly threaded portion ofthe cutting head 24 as shown in Fig. 2. n

The lower end of the cutting head 24 terminates in a circular toothed cutter 27 formed vabout a central core receiving opening 28. Just above the teeth in the cutter 27 is an annular recess 30 in which is freely rotatably ymounted a ring 31 having a series of perforations or openings 32 extending therethrough. Thisring is retained in the recess 30 by the lower end of the sleeve 20 whichis provided with a core receiving opening 33 of approximately the same diameter as the core receiving opening 28 in the :cutting head, the internal y..

ydiameter of the ring 31 being slightly larger than such openings. The ring shown in Figs. `1 to 4 inclusive is a'solid ring and is placed Ain. the annularrecess 30.prior to completion ,of the assemblingofthe parts of the drill, v,but if desiredv a split ring 36 as shown in Fig.

5 may be yusedvand yinserted in the annular f recess after the'parts are assembled. Y The cutting head 24 is provided with two sets of cutting blades,'the lower set consisting 'of lower bla-des 40 angularly disposed on the head 24 and extending outwardly therefrom andan' upper set consisting of blades 41 which extend outwardly a eater distance than the-blades such bla es 41 preferably havl i straight forward faces 42. By angularly er. c1. e which werks upvvirliliie rt the recessie?, .eine '92; y jui or inwiiliing the optar, s??? in .gpaitfrr .5.1i therebr @Ending er tmnal @relybl'lctimmeerl the .core

,le the. ne barrel by means 11,5 flf s1' 9i @tube 50 .Seated 'en f muilfrr 3H 'ritira Asieve 229 redjbeing l;

r e F,ard ierrnation is mes hatdnetnthe ih relighsuelrfor aand e. an ,ing which inthe ordinary core-drill sticks .mthemrerevel e ,Laith rils'havdfapemngbelowthe ts g1 there@ pluga 9" umg, the. @are rof thdrilrvilllg? Sqrerltgrnding l @s fmltlql! and a lure t0 take @are "'.gllheflher multim? Such @Ore as iS .le "ccntrmfrate with the cuttings A shari e irrntetive sample bf E e., 93.1. er *a j nlveritieiijfilerl 31 toms part .of the'ob receiving iand is free to ref tienarvvvitli .rarest to the drill as rgtstes, .tt irrita, if an bei-n the 1.1i11 drill' Steed @Letrveerl y dt 71211 'riilcalating fluid 6r .inthe rerss.6"11.nder such conditiens und .th il. revdes an addif the cere @9er gdjenckmtlre drillf v mveetrerqs nagaan are twisting i fratture@ satkit 'atterrare Wai @a trae sang fr M g a ser@ hanna e tere reenvg core reeciving opening 1n 1a. were 'e am recavlar recess e .faire ing a plurality of lateral openings extending therethrough.

3. In a rotary core drill having a core catcher, a cutting head having a core receiving opening, a circular cutter consisting of a series of teeth formed about said opening, said cutting head havin an annular recess formed in said o ening e ose above said circular cutter and Eelow said core catcher, and a freel rotatable ring in said recess havlng a nlarahty af teral earnings extending therethrou h.

.4. n a. rotary core drill having a core catcher, a cutting head having a core receiving opening formed with an annular recess therein below Said core catcher, and a freely retatable split ring .in said recess.

5. In a rotary core drill, a body member, a sleeve in Asaid body member, a cutting head threaded to Said Sleeve lievi More receiving Opening, said cutting hea, I having an annular recess f orrned in said opening, and a freelyV rotatable ring in .said recess retained therein by the lower end of said S1099.

6. Ina rotary core drill, a body rnember, a Sleeve 1n said body member, a cutting head hreadedto sain sleeve, Ahaving .a .core receiving opening, said cutting head having an annular recess formed in said opening, and a freely rotatable ring in said recess Yretained therein by the lower end of said sleeve, and a core catcher in said sleeve above `said ring.

7. lIn a rotary core drill, a cutting head having a core receiving opening formed with an annular recess therein, and a freely rotatable ring in said recess, Said ring being of slightly larger internal diameter than the core recelving opening in said cutting head. 8. In a rotary core drill, a cuttirig head having a core receiving Opening formed with an annular recess therein, and a freely rotatable ruig 1n said recess, said ring being of slightly larger internal diameter than the said cutting herd,

,and having a plurality .0f Lateral Dpemngs extending therethrough.

9. In a rotary core drill having a core catcher, a cutting head having a Core receiving o penlngtherein and an ,antfffriQtQD ring 1n sind opening below said `care catcher.

In testimony whereof, I. are herermto set my hand at Los Angeles, alifggnia, this 23 dayof August 1928,- Y,

- EONARD $1 QQFELIT- 

